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#include <fstream>
#include <iostream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int mat[1025][1025],v[1025],b[1025],n,m;
void afisare(int i,int j)
{
if(mat[i][j]!=0)
{
while(j>=1&&mat[i][j-1]==mat[i][j])
{
j--;
cout<<"* ";
}
while(i>=1&&mat[i-1][j]==mat[i][j])
{
i--;
cout<<"* ";
}
afisare(i-1,j-1);
fout<<v[i]<<' ';
}
}
int main()
{
fin>>n>>m;
for(int i=1;i<=n;i++)
fin>>v[i];
for(int i=1;i<=m;i++)
fin>>b[i];
for(int i=1;i<=n;i++)
{
for(int j=1;j<=m;j++)
{
if(v[i]==b[j])
{
mat[i][j]=mat[i-1][j-1]+1;
}
else
mat[i][j]=mat[i-1][j]>mat[i][j-1]?mat[i-1][j]:mat[i][j-1];
}
}
fout<<mat[n][m]<<'\n';
afisare(n,m);
fout<<'\n';
return 0;
}